Introduction
If the HP Deskjet fails to produce quality scans or copies, and you have already checked that the scanner glass is clean and that there are no other problems, you may need to replace the Scanner Bar/Light inside the printer. This part is the sensor that illuminates and captures an image of the document you are trying to scan or copy. The steps for removing this part are included in the following guide.
Tools
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Open the protective lid that is covering the glass. Press gently against the base of the panel to remove the lid from the rest of the printer.
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Remove the two cables by gripping each one close to their connection ports on the motherboard and gently disconnecting them.
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Conclusion
To reassemble your device, follow these instructions in reverse order.